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id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2020-08-27T09:15:54.000Z" title="发表于 2020-08-27 17:15:54">2020-08-27</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2021-01-10T12:28:14.256Z" title="更新于 2021-01-10 20:28:14">2021-01-10</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/%E5%89%8D%E7%AB%AF%E5%AD%A6%E4%B9%A0/">前端学习</a></span></div><div class="meta-secondline"> <span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">2.5k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>10分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="四-vue生命周期简介和钩子函数"><a href="#四-vue生命周期简介和钩子函数" class="headerlink" title="四.vue生命周期简介和钩子函数"></a>四.vue生命周期简介和钩子函数</h1><blockquote>
<p>纯属随笔记录，具体详细教程，请查阅<a target="_blank" rel="noopener" href="https://vuejs.bootcss.com/guide/">vue.js官网</a></p>
<p>本篇文章参考自:</p>
<p>作者：赵客缦胡缨v吴钩霜雪明<br>链接：<a target="_blank" rel="noopener" href="https://www.jianshu.com/p/49563e2ad40b">https://www.jianshu.com/p/49563e2ad40b</a></p>
</blockquote>
<ul>
<li><h2 id="什么是生命周期"><a href="#什么是生命周期" class="headerlink" title="什么是生命周期?"></a>什么是生命周期?</h2><p><strong>Vue 的生命周期是</strong>： vue 实例从创建到销毁，也就是从<code>开始创建</code>、<code>初始化数据</code>、<code>编译模板</code>、<code>挂载Dom→渲染</code>、<code>更新→渲染</code>、<code>销毁</code>等一系列过程。就比如我们从出生到死亡所经历的一个个阶段。</p>
</li>
<li><h2 id="什么是钩子函数"><a href="#什么是钩子函数" class="headerlink" title="什么是钩子函数?"></a>什么是钩子函数?</h2><p>在<strong>Vue 的生命周期的</strong>过程中也可以执行一些特定的<strong>生命周期钩子的函数</strong>，这给了用户在不同阶段添加完善代码的机会。一般特定的钩子做特定的事。</p>
</li>
<li><h2 id="Vue生命周期图例"><a href="#Vue生命周期图例" class="headerlink" title="Vue生命周期图例:"></a>Vue生命周期图例:</h2><p><img src= "/img/loading.gif" data-lazy-src="https://s1.ax1x.com/2020/08/27/d45ozd.png" alt="Vue生命周期图例"></p>
</li>
<li><h2 id="Vue8种生命周期函数-钩子函数-："><a href="#Vue8种生命周期函数-钩子函数-：" class="headerlink" title="Vue8种生命周期函数(钩子函数)："></a>Vue8种生命周期函数(钩子函数)：</h2><ol>
<li><p><code>beforeCreate</code>：</p>
<h4 id="官方解释"><a href="#官方解释" class="headerlink" title="官方解释:"></a>官方解释:</h4><p>在实例初始化之后，数据观测 (data observer) 和 event/watcher 事件配置之前被调用。</p>
<h4 id="详细解释"><a href="#详细解释" class="headerlink" title="详细解释:"></a>详细解释:</h4><p>注意是 <strong>之前</strong>，这个时期，this变量还不能使用，在data下的数据，watcher中的事件都不能获得到；这个时候的vue实例还什么都没有，但是$route对象是存在的，可以根据路由信息进行重定向之类的操作。</p>
<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"> Vue.component(<span class="string">&quot;temp&quot;</span>, &#123;</span><br><span class="line">            template: <span class="string">&quot;&lt;h3&gt;&#123;&#123;money&#125;&#125;&lt;/h3&gt;&quot;</span>,</span><br><span class="line">            data() &#123;</span><br><span class="line">                <span class="keyword">return</span> &#123;</span><br><span class="line">                    money: <span class="number">2000</span></span><br><span class="line">                &#125;;</span><br><span class="line">            &#125;,</span><br><span class="line">            methods:&#123;</span><br><span class="line">                add()&#123;</span><br><span class="line">                    <span class="built_in">this</span>.money++</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;,</span><br><span class="line">            beforeCreate() &#123;</span><br><span class="line">                <span class="built_in">console</span>.log(<span class="string">&#x27;data&#x27;</span>, <span class="built_in">this</span>.money);</span><br><span class="line">                <span class="built_in">console</span>.log(<span class="string">&#x27;methods&#x27;</span>,<span class="built_in">this</span>.add);</span><br><span class="line">            &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>

<ul>
<li><p><strong>效果:</strong></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200828/9qMIwah*lYLy.png" alt="效果图"></p>
</li>
</ul>
<hr>
</li>
<li><p><code>created</code>:</p>
<h4 id="官方解释-1"><a href="#官方解释-1" class="headerlink" title="官方解释:"></a>官方解释:</h4><p>在实例创建完成后被立即调用。在这一步，实例已完成以下的配置：数据观测 (data observer)，property 和方法的运算，watch/event 事件回调。然而，挂载阶段还没开始，<code>$el</code> property 目前尚不可用。</p>
<h4 id="详细解释-1"><a href="#详细解释-1" class="headerlink" title="详细解释:"></a>详细解释:</h4><p>这个时候可以操作Vue实例中的数据和各种方法，但是还不能对<code>‘dom’</code>节点进行操作:比如 <code>this.data</code> 可以访问，watcher、events、methods也出现了，若根据后台接口动态改变data和methods的场景下，可以使用。</p>
<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">  Vue.component(<span class="string">&quot;temp&quot;</span>, &#123;</span><br><span class="line">            template: <span class="string">`</span></span><br><span class="line"><span class="string">            &lt;div&gt;</span></span><br><span class="line"><span class="string">              &lt;h3&gt;&#123;&#123;money&#125;&#125;&lt;/h3&gt;</span></span><br><span class="line"><span class="string">              &lt;button&gt;按钮&lt;/button&gt;</span></span><br><span class="line"><span class="string">            &lt;/div&gt;</span></span><br><span class="line"><span class="string">            `</span>,</span><br><span class="line">            data() &#123;</span><br><span class="line">                <span class="keyword">return</span> &#123;</span><br><span class="line">                    money: <span class="number">2000</span></span><br><span class="line">                &#125;;</span><br><span class="line">            &#125;,</span><br><span class="line">            methods:&#123;</span><br><span class="line">                add()&#123;</span><br><span class="line">                    <span class="built_in">this</span>.money++</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;,</span><br><span class="line">            created() &#123;</span><br><span class="line">                <span class="built_in">console</span>.log(<span class="string">&#x27;data&#x27;</span>, <span class="built_in">this</span>.money);</span><br><span class="line">                <span class="built_in">console</span>.log(<span class="string">&#x27;methods&#x27;</span>,<span class="built_in">this</span>.add);</span><br><span class="line">                $(<span class="string">&#x27;button&#x27;</span>).css(<span class="string">&#x27;display&#x27;</span>,<span class="string">&#x27;none&#x27;</span>)</span><br><span class="line">            &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>

<ul>
<li><p><strong>效果:</strong></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200828/8cytdbY@@pNp.png" alt="后台输出数据"></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200828/UMtl3Ch7WTFQ.png" alt="jquery操作dom元素失败"></p>
</li>
</ul>
<hr>
</li>
<li><p><code>beforeMount</code>:</p>
<h4 id="官方解释-2"><a href="#官方解释-2" class="headerlink" title="官方解释:"></a>官方解释:</h4><p>在挂载开始之前被调用：相关的 <code>render</code> 函数首次被调用。</p>
<p>该钩子在服务器端渲染期间不被调用。</p>
<h4 id="详细解释-2"><a href="#详细解释-2" class="headerlink" title="详细解释:"></a>详细解释:</h4><p>载入前（完成了data和el数据初始化），但是页面中的内容还是vue中的占位符，data中的message信息没有被挂在到Bom节点中，在这里可以在渲染前最后一次更改数据的机会，不会触发其他的钩子函数，一般可以在这里做初始数据的获取,<strong>在实际操作中，很多beforeMount阶段干的活在created阶段基本都能做。</strong></p>
<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">Vue.component(<span class="string">&quot;temp&quot;</span>, &#123;</span><br><span class="line">            template: <span class="string">`</span></span><br><span class="line"><span class="string">            &lt;div&gt;</span></span><br><span class="line"><span class="string">              &lt;h3&gt;&#123;&#123;money&#125;&#125;&lt;/h3&gt;</span></span><br><span class="line"><span class="string">              &lt;button&gt;按钮&lt;/button&gt;</span></span><br><span class="line"><span class="string">            &lt;/div&gt;</span></span><br><span class="line"><span class="string">            `</span>,</span><br><span class="line">            data() &#123;</span><br><span class="line">                <span class="keyword">return</span> &#123;</span><br><span class="line">                    money: <span class="number">2000</span></span><br><span class="line">                &#125;;</span><br><span class="line">            &#125;,</span><br><span class="line">            methods:&#123;</span><br><span class="line">                add()&#123;</span><br><span class="line">                    <span class="built_in">this</span>.money++</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;,</span><br><span class="line">            beforeMount() &#123;</span><br><span class="line">                <span class="built_in">console</span>.log(<span class="string">&#x27;data&#x27;</span>, <span class="built_in">this</span>.money);</span><br><span class="line">                <span class="built_in">console</span>.log(<span class="string">&#x27;methods&#x27;</span>,<span class="built_in">this</span>.add);</span><br><span class="line">                <span class="built_in">console</span>.log(<span class="string">&#x27;$el&#x27;</span>,<span class="built_in">this</span>.$el);</span><br><span class="line">                $(<span class="string">&#x27;button&#x27;</span>).css(<span class="string">&#x27;display&#x27;</span>,<span class="string">&#x27;none&#x27;</span>)</span><br><span class="line">            &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>

<ul>
<li><p><strong>效果:</strong></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200828/D6!oDV3U6xjE.png" alt="跟created差不多"></p>
</li>
</ul>
<hr>
</li>
<li><p><code>mounted</code>:</p>
<h4 id="官方解释-3"><a href="#官方解释-3" class="headerlink" title="官方解释:"></a>官方解释:</h4><p>实例被挂载后调用，这时 <code>el</code> 被新创建的 <code>vm.$el</code> 替换了。如果根实例挂载到了一个文档内的元素上，当 <code>mounted</code> 被调用时 <code>vm.$el</code> 也在文档内。</p>
<h4 id="详细解释-3"><a href="#详细解释-3" class="headerlink" title="详细解释:"></a>详细解释:</h4><p>挂载完毕，这时<code>dom</code>节点被渲染到文档内，一些需要<code>dom</code>的操作在此时才能正常进行。此时元素已经渲染完成了，依赖于DOM的代码就放在这里吧~比如监听DOM事件。</p>
<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">Vue.component(<span class="string">&quot;temp&quot;</span>, &#123;</span><br><span class="line">            template: <span class="string">`</span></span><br><span class="line"><span class="string">            &lt;div&gt;</span></span><br><span class="line"><span class="string">              &lt;h3&gt;&#123;&#123;money&#125;&#125;&lt;/h3&gt;</span></span><br><span class="line"><span class="string">              &lt;button&gt;按钮&lt;/button&gt;</span></span><br><span class="line"><span class="string">            &lt;/div&gt;</span></span><br><span class="line"><span class="string">            `</span>,</span><br><span class="line">            data() &#123;</span><br><span class="line">                <span class="keyword">return</span> &#123;</span><br><span class="line">                    money: <span class="number">2000</span></span><br><span class="line">                &#125;;</span><br><span class="line">            &#125;,</span><br><span class="line">            methods:&#123;</span><br><span class="line">                add()&#123;</span><br><span class="line">                    <span class="built_in">this</span>.money++</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;,</span><br><span class="line">            mounted() &#123;</span><br><span class="line">                <span class="built_in">console</span>.log(<span class="string">&#x27;data&#x27;</span>, <span class="built_in">this</span>.money);</span><br><span class="line">                <span class="built_in">console</span>.log(<span class="string">&#x27;methods&#x27;</span>,<span class="built_in">this</span>.add);</span><br><span class="line">                <span class="built_in">console</span>.log(<span class="string">&#x27;$el&#x27;</span>,<span class="built_in">this</span>.$el);</span><br><span class="line">                $(<span class="string">&#x27;button&#x27;</span>).css(<span class="string">&#x27;display&#x27;</span>,<span class="string">&#x27;none&#x27;</span>)</span><br><span class="line">            &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>

<ul>
<li><p><strong>效果:</strong></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200828/Es4IhMdq9URo.png" alt="按钮消失了，可以操作dom了"></p>
</li>
</ul>
<hr>
</li>
<li><p><code>beforeUpdate</code>:</p>
<h4 id="官方解释-4"><a href="#官方解释-4" class="headerlink" title="官方解释:"></a>官方解释:</h4><p>数据更新时调用，发生在虚拟 DOM 打补丁之前。这里适合在更新之前访问现有的 DOM，比如手动移除已添加的事件监听器。</p>
<p><strong>该钩子在服务器端渲染期间不被调用，因为只有初次渲染会在服务端进行。</strong></p>
<h4 id="详细解释-4"><a href="#详细解释-4" class="headerlink" title="详细解释:"></a>详细解释:</h4><p>对应的钩子函数是beforeUpdate。在这一阶段，vue遵循数据驱动DOM的原则；beforeUpdate函数在数据更新后虽然没立即更新数据，但是DOM中的数据会改变，这是Vue双向数据绑定的作用。</p>
<p><strong>只有view上面的数据变化才会触发beforeUpdate和updated，仅属于data中的数据改变是并不能触发</strong></p>
<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">Vue.component(<span class="string">&quot;temp&quot;</span>, &#123;</span><br><span class="line">            template: <span class="string">`</span></span><br><span class="line"><span class="string">         &lt;div&gt;</span></span><br><span class="line"><span class="string">              &lt;h3&gt;&#123;&#123;money&#125;&#125;&lt;/h3&gt;</span></span><br><span class="line"><span class="string">              &lt;button @click = &quot;add&quot;&gt;按钮&lt;/button&gt;</span></span><br><span class="line"><span class="string">            &lt;/div&gt;</span></span><br><span class="line"><span class="string">            `</span>,</span><br><span class="line">            data() &#123;</span><br><span class="line">                <span class="keyword">return</span> &#123;</span><br><span class="line">                    money: <span class="number">2000</span>,</span><br><span class="line">                    message: <span class="string">&#x27;abcd&#x27;</span></span><br><span class="line">                &#125;;</span><br><span class="line">            &#125;,</span><br><span class="line">            methods:&#123;</span><br><span class="line">                add()&#123;</span><br><span class="line">                    <span class="built_in">this</span>.money++</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;,</span><br><span class="line">            beforeUpdate() &#123;</span><br><span class="line">              <span class="built_in">console</span>.group(<span class="string">&#x27;beforeUpdate 更新前状态 ------------&gt;&#x27;</span>);</span><br><span class="line">              <span class="built_in">console</span>.log(<span class="string">&quot;%c%s&quot;</span>, <span class="string">&quot;color:red&quot;</span>,<span class="string">&quot;el     : &quot;</span> + <span class="built_in">this</span>.$el);</span><br><span class="line">              <span class="built_in">console</span>.log(<span class="built_in">this</span>.$el);</span><br><span class="line">              <span class="built_in">console</span>.log(<span class="string">&#x27;真实dom结构：&#x27;</span>+<span class="built_in">document</span>.getElementById(<span class="string">&#x27;app&#x27;</span>).innerHTML);</span><br><span class="line">              <span class="built_in">console</span>.log(<span class="string">&quot;%c%s&quot;</span>, <span class="string">&quot;color:red&quot;</span>,<span class="string">&quot;data   : &quot;</span> + <span class="built_in">this</span>.$data);</span><br><span class="line">              <span class="built_in">console</span>.log(<span class="string">&quot;%c%s&quot;</span>, <span class="string">&quot;color:red&quot;</span>,<span class="string">&quot;message: &quot;</span> + <span class="built_in">this</span>.message);</span><br><span class="line">            &#125;,</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>

<ul>
<li><p><strong>效果:</strong></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200829/1M@bjJ7ey0nN.png" alt="初始效果"></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200829/h8pg78!ekNfw.png" alt="点击按钮后，触发beforeUpdate,看dom结构并更新"></p>
</li>
</ul>
<hr>
</li>
<li><p><code>updated</code>:</p>
<h4 id="官方解释-5"><a href="#官方解释-5" class="headerlink" title="官方解释:"></a>官方解释:</h4><p>由于数据更改导致的虚拟 DOM 重新渲染和打补丁，在这之后会调用该钩子。</p>
<p>当这个钩子被调用时，组件 DOM 已经更新，所以你现在可以执行依赖于 DOM 的操作。然而在大多数情况下，你应该避免在此期间更改状态。如果要相应状态改变，通常最好使用<a target="_blank" rel="noopener" href="https://vuejs.bootcss.com/api/#computed">计算属性</a>或 <a target="_blank" rel="noopener" href="https://vuejs.bootcss.com/api/#watch">watcher</a> 取而代之。</p>
<h4 id="详细解释-5"><a href="#详细解释-5" class="headerlink" title="详细解释:"></a>详细解释:</h4><p>当这个钩子被调用时，组件DOM的data已经更新，所以你现在可以执行依赖于DOM的操作。<strong>但是不要在此时修改data，否则会继续触发beforeUpdate、updated这两个生命周期，进入死循环！</strong></p>
<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">Vue.component(<span class="string">&quot;temp&quot;</span>, &#123;</span><br><span class="line">            template: <span class="string">`</span></span><br><span class="line"><span class="string">            &lt;div&gt;</span></span><br><span class="line"><span class="string">              &lt;h3&gt;&#123;&#123;money&#125;&#125;&lt;/h3&gt;</span></span><br><span class="line"><span class="string">              &lt;button @click = &quot;add&quot;&gt;按钮&lt;/button&gt;</span></span><br><span class="line"><span class="string">            &lt;/div&gt;</span></span><br><span class="line"><span class="string">            `</span>,</span><br><span class="line">            data() &#123;</span><br><span class="line">                <span class="keyword">return</span> &#123;</span><br><span class="line">                    money: <span class="number">2000</span>,</span><br><span class="line">                    message: <span class="string">&#x27;abcd&#x27;</span></span><br><span class="line">                &#125;;</span><br><span class="line">            &#125;,</span><br><span class="line">            methods:&#123;</span><br><span class="line">                add()&#123;</span><br><span class="line">                    <span class="built_in">this</span>.money++</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;,</span><br><span class="line">            updated() &#123;</span><br><span class="line">              <span class="built_in">console</span>.group(<span class="string">&#x27;updated 更新完成状态 ------------&gt;&#x27;</span>);</span><br><span class="line">              <span class="built_in">console</span>.log(<span class="string">&quot;%c%s&quot;</span>, <span class="string">&quot;color:red&quot;</span>,<span class="string">&quot;el     : &quot;</span> + <span class="built_in">this</span>.$el);</span><br><span class="line">              <span class="built_in">console</span>.log(<span class="built_in">this</span>.$el);</span><br><span class="line">              <span class="built_in">console</span>.log(<span class="string">&#x27;真实dom结构：&#x27;</span>+<span class="built_in">document</span>.getElementById(<span class="string">&#x27;app&#x27;</span>).innerHTML);</span><br><span class="line">              <span class="built_in">console</span>.log(<span class="string">&quot;%c%s&quot;</span>, <span class="string">&quot;color:red&quot;</span>,<span class="string">&quot;data   : &quot;</span> + <span class="built_in">this</span>.$data);</span><br><span class="line">              <span class="built_in">console</span>.log(<span class="string">&quot;%c%s&quot;</span>, <span class="string">&quot;color:red&quot;</span>,<span class="string">&quot;message: &quot;</span> + <span class="built_in">this</span>.message);</span><br><span class="line">            &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>

<ul>
<li><p><strong>效果:</strong></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200829/6y!0YReydXBe.png" alt="与beforeUpdate对比，按下按钮后dom结构更新了"></p>
</li>
</ul>
<hr>
</li>
<li><p><code>beforeDestroy</code>:</p>
<h4 id="官方解释-6"><a href="#官方解释-6" class="headerlink" title="官方解释:"></a>官方解释:</h4><p>实例销毁之前调用。在这一步，实例仍然完全可用。</p>
<p><strong>该钩子在服务器端渲染期间不被调用。</strong></p>
<h4 id="详细解释-6"><a href="#详细解释-6" class="headerlink" title="详细解释:"></a>详细解释:</h4><p>在这一步，实例仍然完全可用。实例要被销毁了，在被销毁之前做一些校验和判断。</p>
<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">  Vue.component(<span class="string">&quot;temp&quot;</span>, &#123;</span><br><span class="line">            template: <span class="string">`</span></span><br><span class="line"><span class="string">            &lt;div&gt;</span></span><br><span class="line"><span class="string">              &lt;h3&gt;&#123;&#123;money&#125;&#125;&lt;/h3&gt;</span></span><br><span class="line"><span class="string">              &lt;button @click = &quot;destroy&quot;&gt;按钮&lt;/button&gt;</span></span><br><span class="line"><span class="string">            &lt;/div&gt;</span></span><br><span class="line"><span class="string">            `</span>,</span><br><span class="line">            data() &#123;</span><br><span class="line">                <span class="keyword">return</span> &#123;</span><br><span class="line">                    money: <span class="number">2000</span>,</span><br><span class="line">                    message: <span class="string">&#x27;abcd&#x27;</span></span><br><span class="line">                &#125;;</span><br><span class="line">            &#125;,</span><br><span class="line">            methods:&#123;</span><br><span class="line">                destroy()&#123;</span><br><span class="line">                    <span class="built_in">this</span>.$destroy()</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;,</span><br><span class="line">            beforeDestroy: <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span><br><span class="line">                <span class="built_in">console</span>.group(<span class="string">&#x27;beforeDestroy 销毁前状态===============》&#x27;</span>);</span><br><span class="line">                <span class="built_in">console</span>.log(<span class="string">&quot;%c%s&quot;</span>, <span class="string">&quot;color:red&quot;</span>,<span class="string">&quot;el     : &quot;</span> + <span class="built_in">this</span>.$el);</span><br><span class="line">                <span class="built_in">console</span>.log(<span class="built_in">this</span>.$el);    </span><br><span class="line">                <span class="built_in">console</span>.log(<span class="string">&quot;%c%s&quot;</span>, <span class="string">&quot;color:red&quot;</span>,<span class="string">&quot;data   : &quot;</span> + <span class="built_in">this</span>.$data); </span><br><span class="line">                <span class="built_in">console</span>.log(<span class="string">&quot;%c%s&quot;</span>, <span class="string">&quot;color:red&quot;</span>,<span class="string">&quot;message: &quot;</span> + <span class="built_in">this</span>.message); </span><br><span class="line">            &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>

<ul>
<li><p><strong>效果:</strong></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200829/LbO@nLYIUPnD.png" alt="点击按钮后销毁实例，触发beforeDestroy"></p>
</li>
</ul>
<hr>
</li>
<li><p><code>destroyed</code>:</p>
<h4 id="官方解释-7"><a href="#官方解释-7" class="headerlink" title="官方解释:"></a>官方解释:</h4><p>实例销毁后调用。该钩子被调用后，对应 Vue 实例的所有指令都被解绑，所有的事件监听器被移除，所有的子实例也都被销毁。</p>
<p><strong>该钩子在服务器端渲染期间不被调用。</strong></p>
<h4 id="详细解释-7"><a href="#详细解释-7" class="headerlink" title="详细解释:"></a>详细解释:</h4><p>此时，Vue实例指示的所有东西已经解绑定，所有的事件监听器都已经被移除，所有的子实例也已经被销毁。这时候能做的事情已经不多了，只能加点儿提示toast之类的东西吧。</p>
<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"> Vue.component(<span class="string">&quot;temp&quot;</span>, &#123;</span><br><span class="line">            template: <span class="string">`</span></span><br><span class="line"><span class="string">            &lt;div&gt;</span></span><br><span class="line"><span class="string">              &lt;h3&gt;&#123;&#123;money&#125;&#125;&lt;/h3&gt;</span></span><br><span class="line"><span class="string">              &lt;button @click = &quot;destroy&quot;&gt;按钮&lt;/button&gt;</span></span><br><span class="line"><span class="string">            &lt;/div&gt;</span></span><br><span class="line"><span class="string">            `</span>,</span><br><span class="line">            data() &#123;</span><br><span class="line">                <span class="keyword">return</span> &#123;</span><br><span class="line">                    money: <span class="number">2000</span>,</span><br><span class="line">                    message: <span class="string">&#x27;abcd&#x27;</span></span><br><span class="line">                &#125;;</span><br><span class="line">            &#125;,</span><br><span class="line">            methods:&#123;</span><br><span class="line">                destroy()&#123;</span><br><span class="line">                    <span class="built_in">this</span>.$destroy()</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;,</span><br><span class="line">            destroyed() &#123;</span><br><span class="line">                <span class="built_in">console</span>.group(<span class="string">&#x27;destroyed 销毁完成状态 ------------&gt;&#x27;</span>);</span><br><span class="line">                <span class="built_in">console</span>.log(<span class="string">&quot;%c%s&quot;</span>, <span class="string">&quot;color:red&quot;</span>,<span class="string">&quot;el     : &quot;</span> + <span class="built_in">this</span>.$el);</span><br><span class="line">                <span class="built_in">console</span>.log(<span class="built_in">this</span>.$el);</span><br><span class="line">                <span class="built_in">console</span>.log(<span class="string">&quot;%c%s&quot;</span>, <span class="string">&quot;color:red&quot;</span>,<span class="string">&quot;data   : &quot;</span> + <span class="built_in">this</span>.$data);</span><br><span class="line">                <span class="built_in">console</span>.log(<span class="string">&quot;%c%s&quot;</span>, <span class="string">&quot;color:red&quot;</span>,<span class="string">&quot;message: &quot;</span> + <span class="built_in">this</span>.message)</span><br><span class="line">            &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>

<ul>
<li><p><strong>效果:</strong></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20200829/I8^i^MFNIC0D.png" alt="点击按钮后，触发destroyed销毁完成"></p>
<ul>
<li><p><strong>注:</strong></p>
<p>可以发现beforeDestory和destoryed打印出来的结果并没有什么特别，el的值data的数据依然在的。这是因为$destroy只是销毁一个实例，清理它与其它实例的连接，解绑它的全部指令及事件监听器，并不会清除data的数据或者清除dom。具体可看官方文档</p>
</li>
</ul>
</li>
</ul>
<hr>
</li>
<li><p><code>activated</code>:</p>
<h4 id="官方解释-8"><a href="#官方解释-8" class="headerlink" title="官方解释:"></a>官方解释:</h4><p>被 keep-alive 缓存的组件激活时调用。</p>
<p><strong>该钩子在服务器端渲染期间不被调用。</strong></p>
<h4 id="详细解释-8"><a href="#详细解释-8" class="headerlink" title="详细解释:"></a>详细解释:</h4><p>页面出现的时候执行 activated生命周期函数，跟监听 watch 有类似的作用。activated生命周期函数，是配合 keep-alive 进行使用或者路由跳转。进入页面时，mounted 与 activated 生命周期函数都会执行，当前 keep-alive 时或者路由跳转，进行了缓存，这时返回上一页 ，mounted生命周期函数不会执行，而 activated 会执行。组件被激活后的钩子函数，每次回到页面都会执行</p>
<hr>
</li>
<li><p><code>deactivated</code>:</p>
<h4 id="官方解释-9"><a href="#官方解释-9" class="headerlink" title="官方解释:"></a>官方解释:</h4><p>被 keep-alive 缓存的组件停用时调用。</p>
<p><strong>该钩子在服务器端渲染期间不被调用。</strong></p>
<h4 id="详细解释-9"><a href="#详细解释-9" class="headerlink" title="详细解释:"></a>详细解释:</h4><p>该钩子函数配合keep-alive来使用，使用了keep-alive就不会调用beforeDestory和destoryed钩子了，因为组件没有被销毁，而是被缓存起来了，所以deactivated钩子可以看做是beforeDestory和destoryed的替代。</p>
<hr>
</li>
</ol>
</li>
</ul>
</article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="mailto:undefined">六根清静</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="https://liugenqingjing2.coding.me/2020/08/27/Vue%E7%9F%A5%E8%AF%86%E7%82%B9%E6%80%BB%E7%BB%93-%E5%9B%9B-%E7%94%9F%E5%91%BD%E5%91%A8%E6%9C%9F/">https://liugenqingjing2.coding.me/2020/08/27/Vue知识点总结-四-生命周期/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://liugenqingjing2.coding.me" target="_blank">小何blog (记录美好)</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" 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class="card-widget card-history"><div class="card-content"><div class="item-headline"><i class="fas fa-paw fa-spin"></i><span>那年今日</span></div><div id="history-news" style="height: 100px;overflow: hidden;"><div id="history-card"></div></div></div></div><div class="card-widget card-announcement"><div class="card-content"><div class="item-headline"><i class="fas fa-bullhorn card-announcement-animation"></i><span>公告</span></div><div class="announcement_content">大学生一枚，软件工程，想做全栈攻城狮，哈哈，有兴趣可以加 QQ:484695754 (也可以点上面的logo)，一起交流学习</div></div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="card-content"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#%E5%9B%9B-vue%E7%94%9F%E5%91%BD%E5%91%A8%E6%9C%9F%E7%AE%80%E4%BB%8B%E5%92%8C%E9%92%A9%E5%AD%90%E5%87%BD%E6%95%B0"><span class="toc-number">1.</span> <span class="toc-text">四.vue生命周期简介和钩子函数</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%BB%80%E4%B9%88%E6%98%AF%E7%94%9F%E5%91%BD%E5%91%A8%E6%9C%9F"><span class="toc-number">1.1.</span> <span class="toc-text">什么是生命周期?</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%BB%80%E4%B9%88%E6%98%AF%E9%92%A9%E5%AD%90%E5%87%BD%E6%95%B0"><span class="toc-number">1.2.</span> <span class="toc-text">什么是钩子函数?</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Vue%E7%94%9F%E5%91%BD%E5%91%A8%E6%9C%9F%E5%9B%BE%E4%BE%8B"><span class="toc-number">1.3.</span> <span class="toc-text">Vue生命周期图例:</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Vue8%E7%A7%8D%E7%94%9F%E5%91%BD%E5%91%A8%E6%9C%9F%E5%87%BD%E6%95%B0-%E9%92%A9%E5%AD%90%E5%87%BD%E6%95%B0-%EF%BC%9A"><span class="toc-number">1.4.</span> <span class="toc-text">Vue8种生命周期函数(钩子函数)：</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%AE%98%E6%96%B9%E8%A7%A3%E9%87%8A"><span class="toc-number">1.4.0.1.</span> <span class="toc-text">官方解释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E8%AF%A6%E7%BB%86%E8%A7%A3%E9%87%8A"><span class="toc-number">1.4.0.2.</span> <span class="toc-text">详细解释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%AE%98%E6%96%B9%E8%A7%A3%E9%87%8A-1"><span class="toc-number">1.4.0.3.</span> <span class="toc-text">官方解释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E8%AF%A6%E7%BB%86%E8%A7%A3%E9%87%8A-1"><span class="toc-number">1.4.0.4.</span> <span class="toc-text">详细解释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%AE%98%E6%96%B9%E8%A7%A3%E9%87%8A-2"><span class="toc-number">1.4.0.5.</span> <span class="toc-text">官方解释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E8%AF%A6%E7%BB%86%E8%A7%A3%E9%87%8A-2"><span class="toc-number">1.4.0.6.</span> <span class="toc-text">详细解释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%AE%98%E6%96%B9%E8%A7%A3%E9%87%8A-3"><span class="toc-number">1.4.0.7.</span> <span class="toc-text">官方解释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E8%AF%A6%E7%BB%86%E8%A7%A3%E9%87%8A-3"><span class="toc-number">1.4.0.8.</span> <span class="toc-text">详细解释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%AE%98%E6%96%B9%E8%A7%A3%E9%87%8A-4"><span class="toc-number">1.4.0.9.</span> <span class="toc-text">官方解释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E8%AF%A6%E7%BB%86%E8%A7%A3%E9%87%8A-4"><span class="toc-number">1.4.0.10.</span> <span class="toc-text">详细解释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%AE%98%E6%96%B9%E8%A7%A3%E9%87%8A-5"><span class="toc-number">1.4.0.11.</span> <span class="toc-text">官方解释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E8%AF%A6%E7%BB%86%E8%A7%A3%E9%87%8A-5"><span class="toc-number">1.4.0.12.</span> <span class="toc-text">详细解释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%AE%98%E6%96%B9%E8%A7%A3%E9%87%8A-6"><span class="toc-number">1.4.0.13.</span> <span class="toc-text">官方解释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E8%AF%A6%E7%BB%86%E8%A7%A3%E9%87%8A-6"><span class="toc-number">1.4.0.14.</span> <span class="toc-text">详细解释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%AE%98%E6%96%B9%E8%A7%A3%E9%87%8A-7"><span class="toc-number">1.4.0.15.</span> <span class="toc-text">官方解释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E8%AF%A6%E7%BB%86%E8%A7%A3%E9%87%8A-7"><span class="toc-number">1.4.0.16.</span> <span class="toc-text">详细解释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%AE%98%E6%96%B9%E8%A7%A3%E9%87%8A-8"><span class="toc-number">1.4.0.17.</span> <span class="toc-text">官方解释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E8%AF%A6%E7%BB%86%E8%A7%A3%E9%87%8A-8"><span class="toc-number">1.4.0.18.</span> <span class="toc-text">详细解释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%AE%98%E6%96%B9%E8%A7%A3%E9%87%8A-9"><span class="toc-number">1.4.0.19.</span> <span class="toc-text">官方解释:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E8%AF%A6%E7%BB%86%E8%A7%A3%E9%87%8A-9"><span class="toc-number">1.4.0.20.</span> <span class="toc-text">详细解释:</span></a></li></ol></li></ol></li></ol></li></ol></div></div></div><div class="card-widget card-recent-post"><div class="card-content"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div 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